Musquodoboit Harbour
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Musquodoboit Harbour clear sky chart from 2005-11-05 to 2018-02-22.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
22%
16048
12%
48956
5%
16003
29%
16003
14%
36476

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
12%
825
9%
2716
2%
821
19%
821
8%
2098
January16th to endNight
13%
844
11%
2756
3%
844
23%
844
10%
2092
February1st to 15thNight
14%
764
8%
2481
2%
761
21%
761
9%
1952
February16th to endNight
15%
659
8%
2101
2%
659
22%
659
9%
1643
March1st to 15thNight
18%
720
13%
2011
4%
720
26%
720
14%
1531
March16th to endNight
20%
753
13%
2097
4%
753
28%
753
15%
1567
April1st to 15thNight
16%
539
12%
1796
4%
539
25%
539
12%
1335
April16th to endNight
20%
540
13%
1666
6%
540
27%
540
15%
1222
May1st to 15thNight
22%
540
9%
1497
4%
540
26%
540
13%
1183
May16th to endNight
22%
561
9%
1496
3%
560
28%
560
15%
1146
June1st to 15thNight
18%
540
6%
1440
2%
540
21%
540
13%
1169
June16th to endNight
25%
540
6%
1440
2%
540
28%
540
16%
1123
July1st to 15thNight
36%
510
7%
1360
4%
510
38%
510
20%
1015
July16th to endNight
35%
565
8%
1436
7%
532
36%
532
17%
1117
August1st to 15thNight
39%
539
11%
1608
8%
535
40%
535
18%
1175
August16th to endNight
40%
573
16%
1808
12%
573
44%
573
21%
1230
September1st to 15thNight
34%
540
15%
1800
10%
540
42%
540
22%
1168
September16th to endNight
34%
669
21%
1991
13%
669
42%
669
23%
1309
October1st to 15thNight
31%
720
18%
2160
8%
720
39%
720
23%
1433
October16th to endNight
19%
772
16%
2318
6%
772
27%
772
16%
1649
November1st to 15thNight
23%
805
12%
2606
7%
805
29%
805
14%
1910
November16th to endNight
21%
825
12%
2730
5%
825
30%
825
12%
1995
December1st to 15thNight
11%
825
10%
2730
1%
825
20%
825
8%
2146
December16th to endNight
11%
880
10%
2912
2%
880
21%
880
8%
2268

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
23%9%46%5%34446%27%
49300
Night
22%9%36%5%34446%29%
49130
TransparencyDay
56%6%12%16%7%
48992
Night
55%6%12%18%7%
48956
SeeingDay
29%16%29%17%6%1
8055
Night
27%14%30%20%5%
16048

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
18%12%46%7%36%6%46%21%
1552
16th to endDay
18%12%46%6%36%5%5%8%23%
1817
February1st to 15thDay
20%13%48%6%45%45%5%21%
1710
16th to endDay
14%15%6%8%5%34347%24%
1519
March1st to 15thDay
20%12%48%5%35%33426%
1936
16th to endDay
18%12%5%8%5%3433429%
2127
April1st to 15thDay
25%12%47%5%24445%24%
2153
16th to endDay
26%9%35%433346%28%
2292
May1st to 15thDay
29%9%35%6%23445%24%
2455
16th to endDay
26%10%45%5%33346%26%
2618
June1st to 15thDay
31%9%36%5%23446%21%
2520
16th to endDay
27%9%45%5%24346%25%
2520
July1st to 15thDay
22%8%3442345%9%30%
2520
16th to endDay
25%9%46%43445%6%24%
2633
August1st to 15thDay
21%7%26%5%3445%7%29%
2340
16th to endDay
16%7%25%3245%5%7%38%
2393
September1st to 15thDay
22%6%245%33348%35%
2160
16th to endDay
19%425%423448%39%
1966
October1st to 15thDay
20%5%26%42345%7%36%
1800
16th to endDay
22%7%36%7%24446%29%
1905
November1st to 15thDay
24%10%45%5%3345%5%26%
1580
16th to endDay
21%8%47%6%35%45%6%25%
1560
December1st to 15thDay
27%9%47%6%34436%22%
1560
16th to endDay
23%12%48%6%34435%22%
1664
January1st to 15thNight
18%10%38%6%35%6%5%7%23%
2716
16th to endNight
20%10%47%6%35%45%6%25%
2756
February1st to 15thNight
20%10%5%8%7%5%6%45%6%21%
2480
16th to endNight
16%12%5%9%8%4445%5%23%
2101
March1st to 15thNight
22%10%35%5%35%5%5%6%27%
1999
16th to endNight
20%9%37%6%24445%30%
2097
April1st to 15thNight
25%11%35%5%2444429%
1796
16th to endNight
25%8%45%5%23446%30%
1666
May1st to 15thNight
31%8%35%434446%23%
1497
16th to endNight
23%8%35%5%345%47%27%
1494
June1st to 15thNight
33%10%34424335%23%
1440
16th to endNight
28%8%36%424335%28%
1440
July1st to 15thNight
19%8%26%5%3346%9%29%
1440
16th to endNight
24%10%35%5%25%45%7%26%
1533
August1st to 15thNight
20%10%25%5%2445%6%32%
1620
16th to endNight
18%6%26%42345%5%39%
1808
September1st to 15thNight
18%5%25%42445%6%41%
1800
16th to endNight
21%6%24423345%42%
1991
October1st to 15thNight
20%5%25%324346%40%
2160
16th to endNight
24%7%25%434436%34%
2318
November1st to 15thNight
24%8%36%5%2445%6%28%
2606
16th to endNight
22%7%35%5%25%447%30%
2730
December1st to 15thNight
25%10%46%5%3435%5%23%
2730
16th to endNight
23%11%47%6%3445%5%21%
2912

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
60%8%13%13%3
1553
16th to endDay
58%6%11%16%7%
1817
February1st to 15thDay
63%6%10%12%6%
1713
16th to endDay
61%5%10%14%6%1
1519
March1st to 15thDay
61%310%14%8%1
1947
16th to endDay
58%311%16%8%
2127
April1st to 15thDay
62%47%13%10%1
2153
16th to endDay
56%5%9%16%10%1
2292
May1st to 15thDay
61%5%9%16%6%
2455
16th to endDay
60%5%11%16%6%
2622
June1st to 15thDay
64%6%10%11%5%
2520
16th to endDay
59%7%11%14%6%
2520
July1st to 15thDay
48%8%17%17%8%
2372
16th to endDay
59%8%11%15%4
2467
August1st to 15thDay
52%7%16%17%6%
2327
16th to endDay
41%7%18%24%7%
2393
September1st to 15thDay
48%5%11%22%10%1
2160
16th to endDay
43%5%11%25%12%
1966
October1st to 15thDay
46%5%12%23%11%
1800
16th to endDay
54%414%20%5%
1905
November1st to 15thDay
58%6%11%16%7%
1580
16th to endDay
58%8%13%13%6%
1560
December1st to 15thDay
63%7%11%14%3
1560
16th to endDay
64%410%12%7%
1664
January1st to 15thNight
58%9%13%15%3
2716
16th to endNight
57%7%12%18%4
2756
February1st to 15thNight
62%6%11%12%5%
2481
16th to endNight
61%7%12%13%5%
2101
March1st to 15thNight
55%6%12%16%8%
2011
16th to endNight
55%5%10%18%8%1
2097
April1st to 15thNight
57%5%9%15%9%1
1796
16th to endNight
54%5%10%16%11%1
1666
May1st to 15thNight
60%6%8%17%5%
1497
16th to endNight
55%6%12%17%5%1
1496
June1st to 15thNight
64%5%9%14%5%
1440
16th to endNight
58%6%10%15%8%
1440
July1st to 15thNight
47%10%15%17%8%
1360
16th to endNight
55%8%12%15%6%
1436
August1st to 15thNight
51%7%13%21%5%
1608
16th to endNight
44%8%13%22%10%
1808
September1st to 15thNight
42%6%13%24%10%1
1800
16th to endNight
44%411%27%12%
1991
October1st to 15thNight
44%412%26%10%
2160
16th to endNight
51%5%11%21%9%
2318
November1st to 15thNight
54%6%13%17%7%
2606
16th to endNight
53%7%14%16%6%
2730
December1st to 15thNight
61%7%11%15%3
2730
16th to endNight
62%6%10%15%5%
2912

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
27%22%31%16%1
285
16th to endDay
29%21%37%9%3
304
February1st to 15thDay
33%19%29%16%1
281
16th to endDay
27%21%31%14%3
232
March1st to 15thDay
26%25%29%13%4
265
16th to endDay
31%22%26%13%31
288
April1st to 15thDay
34%22%29%8%4
270
16th to endDay
24%21%33%15%41
270
May1st to 15thDay
39%11%26%15%5%2
411
16th to endDay
33%12%31%17%4
519
June1st to 15thDay
35%13%24%20%5%
495
16th to endDay
33%12%27%18%5%2
495
July1st to 15thDay
26%9%28%23%11%
475
16th to endDay
34%7%24%23%9%1
494
August1st to 15thDay
26%9%31%19%10%2
313
16th to endDay
21%10%28%22%13%3
332
September1st to 15thDay
23%13%31%21%9%
315
16th to endDay
23%10%26%24%11%3
299
October1st to 15thDay
24%11%33%16%10%2
270
16th to endDay
27%20%29%12%8%1
288
November1st to 15thDay
25%18%27%18%8%2
280
16th to endDay
26%21%29%14%6%1
285
December1st to 15thDay
37%20%25%14%2
285
16th to endDay
29%26%29%12%1
304
January1st to 15thNight
27%21%34%15%1
825
16th to endNight
27%20%35%14%2
844
February1st to 15thNight
26%20%33%17%1
764
16th to endNight
25%21%31%17%4
659
March1st to 15thNight
27%19%30%18%3
720
16th to endNight
27%18%28%19%5%
753
April1st to 15thNight
31%14%32%16%4
539
16th to endNight
31%14%31%19%3
540
May1st to 15thNight
34%11%28%17%7%1
540
16th to endNight
25%12%35%21%5%
561
June1st to 15thNight
37%8%30%18%3
540
16th to endNight
29%8%32%23%5%
540
July1st to 15thNight
21%6%29%34%8%
510
16th to endNight
26%7%26%29%10%
565
August1st to 15thNight
24%5%24%30%13%
539
16th to endNight
22%6%25%34%11%
573
September1st to 15thNight
21%8%30%27%10%
540
16th to endNight
24%9%27%26%10%1
669
October1st to 15thNight
23%10%30%25%8%1
720
16th to endNight
28%16%32%16%5%
772
November1st to 15thNight
28%11%30%21%6%1
805
16th to endNight
28%17%28%20%5%
825
December1st to 15thNight
34%18%31%12%3
825
16th to endNight
31%22%29%13%1
880
Page generated at 2018-02-23 12:21:30. Version ac04

Copyright 2018 A. Danko


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